One vertex per element, one color per generator, with an edge from x to x·s.
(2,7)(3,11)(4,5)(9,10)(12,13)(14,16)(17,18)(19,25)(20,28)(21,23)(22,27)(24,30)(26,32)(29,31) involution — undirected(1,2)(3,8)(4,10)(5,7)(6,9)(11,16)(12,15)(13,14)(17,19)(18,22)(20,29)(21,26)(23,31)(24,32)(25,28)(27,30) involution — undirected(1,3)(2,8)(4,11)(5,13)(6,12)(7,14)(9,15)(10,16)(20,30)(24,28)(25,32)(27,29) involution — undirected(2,9)(7,10)(8,15)(14,16)(19,26)(22,31)(25,32)(27,29) involution — undirected(1,4,6,5)(2,10,9,7)(3,11,12,13)(8,16,15,14)(18,23)(22,31)(24,28)(25,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.